OBAN STW Wastewater Treatment Plant, Oban, Scotland

OBAN STW is a municipal wastewater treatment plant serving the town of Oban, located in the Argyll and Bute council area of Scotland, United Kingdom. The plant serves a population of approximately 13,228 people, placing it in the category of a medium-sized agglomeration under Scottish water regulations. As a Scottish wastewater treatment plant, OBAN STW operates under the regulatory framework of the Urban Waste Water Treatment (Scotland) Regulations 1994, which transpose the EU Urban Waste Water Treatment Directive (91/271/EEC). For agglomerations of this size, secondary treatment is typically required, with additional nutrient removal if discharging into sensitive areas. The plant's designed capacity is 1.00 million litres per day. The plant discharges treated effluent into the coastal waters of the Firth of Lorn, a sea loch that forms part of the wider Atlantic Ocean ecosystem. The Firth of Lorn supports diverse marine life, including important habitats for fish and seabirds. The area is known for its scenic coastline and is part of the Hebrides region, with strong tidal flows that aid in dispersion of treated wastewater.

OBAN STW discharges into the Firth of Lorn, a sea loch on the west coast of Scotland that connects to the Atlantic Ocean. The Firth of Lorn is a dynamic marine environment with strong tidal currents, supporting diverse habitats such as kelp forests and rocky reefs. The area is important for commercial fisheries and wildlife, including seals, otters, and seabirds. The plant's coastal location means that treated effluent is rapidly diluted in the marine environment, reducing potential impacts on local water quality.